Improvement in protecting iron against corrosion



wand ates jfiatmt em;

CORNELIUS GODFREY AND REUBEN LIGHTHALL OF NEW YORK, N. Y

Letters Patent No. 199,508,

dated. November 22, 1870.

The Schedule referred to in these Letters Patent and making pan: of the same.

'l'oall whom it may concern ie it known thatwc, ()onxnmt's (tom-any and Rummy IneuTnALL, ot' the city, county, and State oi' New York, have invented a new and improved Mode of Preventing lorrosiou of Iron exposed to water or dampness; and-we do hereby declare that the following is ai'ull, clear, and exact description of the same.

The oxidation and corrosion to which iron is subject when in contact with water, more especially salt water, is the cause ol'serious deterioration ot' the structures of which it foris'is the whole or part, and this is more especially the case when such oxidation or corrosion is promoted or augmented by a certain galvanio action arising from the presence of another metal or other metals, with which the iron forms an electric battery, in which the iron forms the electro-positive element and the other metal or metals form the elec-' Ire-negative element, for in such case. the oxygen of the Our invention consists in effecting this object by connecting with the iron a metal or combination of metals or alloy which shall be cleetro-pos1ti ve with reference to iron, such, for instance, as zinc, or alloys of zinc, with tin or other metals, or mechanical combinations of zinc and tin. We do not, howerer, propose to attach such metals or alloyscontilmonsly over the whole surface of the iron exposed to the action of the water, but at any convenient and distant points of such surface.

The applications which may he made of this in- \entiou are numerous and varied. Among the many structures and articles to whichit maybe applied may be mentioned stean'i-boilers, anchors andthcir chains, buoys, the DIQPClllITg-SC I CXVMH steam-vessels andtheir shafts, and the appurtenances oi" the same, rudders, iron pumps, water-meters, and iron pipes laid in the ground or elsewhere. 1

Many modifications will be necessary in the application of the invention, according to the nature, form,

and exposurev of the structures, bodies, or articles to which it is applied.

The electro-positire metal may be lnshioned and collars, rings, bands, nuts, straps, plates, or couplings. .What is here claimed, and desired to be secured by Letters Patent, is

. The protection of iron surtaces or bodies from oxidation or corrosion, when exposed to the action ot'ti'esh or salt water or dampness, by applying to the iron auelect ro-positive metal, alloy, or combination composed olzinc aud'tiu, substantially as hercinahove described.

' OORNL. GODFREY.

, ltlQUBlSX LIGlItllALl Witnesses:

J 01m Brsnmi, A. G. BUELL.

l K i 

